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The data collected from different applications require proper mechanism of extracting knowledge/information from large repositories for better decision making. Knowledge Discovery in Databases (KDD), often called data mining, aims at the discovery of useful information from large collections of data. Data mining is the process of finding new patterns from large amount of data. This paper discusses few of data mining techniques like artificial neural network, decision trees, and nearest neighbor method .Each of these techniques analyzes data in different ways. This paper also discusses how organizations have adopted data mining technologies to improve their businesses.